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E. B. HORN.

STEM WINDING WATCH.

No. 65,747. Patented July 11, 1867.

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EDWIN B. HORN, OF BOSTON, MASSACHUSETTS. Letters Patent 1V0. 65,747, dated June ll, 186T.

IMPROVEMENT IN STEM-WINDING WATCHES.

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TO ALL WHOM IT MAY CONCERN:

Be it known that I, EDWIN B. HORN, of Boston, in the county of Suffolk, and State of Massachusetts, have invented certain new and useful improvements in Stem-Winding Watches; and I do hereby declare that the following is a full and exact description thereof, reference being bad to the accompanying drawings, and to the letters of reference marked thereon.

The nature of my invention consists in an improved and simplified arrangement for winding up and setting stem-winding watches.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and use; In the drawings Figure 1 is a plan, showing the front side of the front plate of a. watch having myimproved stem-winding attachment.

Figure 2 shows an inside view of the front plate.

Figure 4 is a plan, showing the ring gear D.

Figure 5 is across-section, taken at right angles to the stem of the watch.

In the drawings the pendant and ring of the watch are not shown, as my watch in this respect is similar to other watches. In the drawings the parts are magnified to twice the real size,.and the parts of a watch not essential to my invention are omitted.

I construct my invention as follows:

B, figs. 1, 2, 3, and 5, represents the front plate of a watch. A, figs. 1, 2, and 3, is a milled head stem. It is attached to the front plate of the watch by means of the part C, fig. 2, or by any suitable means. .The stem A has upon its inner end a pinion, D, as is shown in figs. 2 and i3, and is hollow, as shown in section, fig. 3. Through the centre of the stem A a second stem, L L, passes. D, fig. 4, is a ring-gear, having gearings cut upon one face, and upon its periphery this ring-gear D revolves in an annular groove cut into the front plate of the watch, as shown in figs. 2, 3, and 5. The teeth upon the face of this ring-gear mesh into the pinion D of the stem A, while the teeth of its periphery mesh into the gear-wheel E. the wheel E being connected to the barrel upon which the main-spring of the watch is Wound. v g

It will be seen from .the above that if you turn the milled head of the stem A the ring-gear D will revolve, carrying with it the gear-wheel E, thus winding up the watch.

I will now describe the apparatus by which the hands are set. Attachd to the inner end of the stem L is a small pinion, L, figs. 2 and 3. It meshes into and operates the gear K, figs. 1, 2, and This gear K runs upon a stud, which is attached to the lever M M, fig. 1. This lever swings, carrying with it the gear-wheel K on the screw S, fig. 1, but isheld back by the spring S, so that the teeth of the gear-=vheel K will not mesh into the eeth ofthe gear-wheel K unless the lever MM is pressed forward by means of-tlie pin N. The gear-wheel K is usually called the centre pinion of a watch, it being connected to the spindle which carries the hands. To set .the hands, I press down on the piuN, which, acting upon the lever M M, throws the gear-wheel K into gear with the pinion K. Then I turn'L, which causes the pinion L, figs. 2 and 3, to revolve which in turn revolves the gears K K, figs. 1 and 3,.and thus moves the hands asdesircd.

The advantages of my invention 'may be set forth thus: By using a ring-gear, D, instead of a. wheel, I take up no valuable space in the watch, as will be'readily understood by any watch-maker. Agaiu, the arrangement as'described is very simple, strong, and not liable to get out of order, the ring-gear being so firmly in its place that it will not get loose, slip, and break the teeth, as in othermethods.

What I claim as my invention, and desire to secure by Letters Patent of the United States, is-

l. The ring-gear D, when arranged in combination with the face of a watch, substantially as described and for the purpose set forth.

2.. I claim the auxiliary stem L L, passing through the centre of the windin" stem A, substantially as described and for the purpose set forth. 7

3. I claim the combination, as well as the arrangement, of the auxiliary stem L with the gear-wheels K K and the lever M M. substantially as described and for the purpose set forth.

EDWIN B. HORN Witnesses:

A. Hun Bean, F. G. Panm. 

